FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/vybrid/vf_src.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * Vybrid Family System Reset Controller (SRC)
     * Chapter 18, Vybrid Reference Manual, Rev. 5, 07/2013
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/malloc.h>
    #include <sys/rman.h>
    #include <sys/timeet.h>
    #include <sys/timetc.h>
    #include <sys/watchdog.h>
    
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <machine/bus.h>
    #include <machine/cpu.h>
    #include <machine/intr.h>
    
    #include <arm/freescale/vybrid/vf_src.h>
    #include <arm/freescale/vybrid/vf_common.h>
    
    #define SRC_SCR         0x00    /* SRC Control Register */
    #define SRC_SBMR1       0x04    /* SRC Boot Mode Register 1 */
    #define SRC_SRSR        0x08    /* SRC Status Register */
    #define SRC_SECR        0x0C    /* SRC_SECR */
    #define SRC_SICR        0x14    /* SRC Reset Interrupt Configuration Register */
    #define SRC_SIMR        0x18    /* SRC Interrupt Masking Register */
    #define SRC_SBMR2       0x1C    /* SRC Boot Mode Register 2 */
    #define SRC_GPR0        0x20    /* General Purpose Register */
    #define SRC_GPR1        0x24    /* General Purpose Register */
    #define SRC_GPR2        0x28    /* General Purpose Register */
    #define SRC_GPR3        0x2C    /* General Purpose Register */
    #define SRC_GPR4        0x30    /* General Purpose Register */
    #define SRC_MISC0       0x4C    /* MISC0 */
    #define SRC_MISC1       0x50    /* MISC1 */
    #define SRC_MISC2       0x54    /* MISC2 */
    #define SRC_MISC3       0x58    /* MISC3 */
    
    struct src_softc {
            struct resource         *res[1];
            bus_space_tag_t         bst;
            bus_space_handle_t      bsh;
    };
    
    struct src_softc *src_sc;
    
    static struct resource_spec src_spec[] = {
            { SYS_RES_MEMORY,       0,      RF_ACTIVE },
            { -1, 0 }
    };
    
    int
    src_swreset(void)
    {
    
            if (src_sc == NULL)
                    return (1);
    
            WRITE4(src_sc, SRC_SCR, SW_RST);
    
            return (0);
    }
   
   static int
   src_probe(device_t dev)
   {
   
           if (!ofw_bus_status_okay(dev))
                   return (ENXIO);
   
           if (!ofw_bus_is_compatible(dev, "fsl,mvf600-src"))
                   return (ENXIO);
   
           device_set_desc(dev, "Vybrid Family System Reset Controller");
           return (BUS_PROBE_DEFAULT);
   }
   
   static int
   src_attach(device_t dev)
   {
           struct src_softc *sc;
   
           sc = device_get_softc(dev);
   
           if (bus_alloc_resources(dev, src_spec, sc->res)) {
                   device_printf(dev, "could not allocate resources\n");
                   return (ENXIO);
           }
   
           /* Memory interface */
           sc->bst = rman_get_bustag(sc->res[0]);
           sc->bsh = rman_get_bushandle(sc->res[0]);
   
           src_sc = sc;
   
           return (0);
   }
   
   static device_method_t src_methods[] = {
           DEVMETHOD(device_probe,         src_probe),
           DEVMETHOD(device_attach,        src_attach),
           { 0, 0 }
   };
   
   static driver_t src_driver = {
           "src",
           src_methods,
           sizeof(struct src_softc),
   };
   
   DRIVER_MODULE(src, simplebus, src_driver, 0, 0);

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